meta-ast 0.7.0

use std::str::FromStr;

use clap::Parser;

/// Polyglot static analyzer that builds symbol surfaces and cross-file dependency graphs.
#[derive(Parser)]
#[command(name = "meta-ast", version, about = "Polyglot static analyzer")]
pub enum Cli {
    /// Inspect a project directory/file and extract all symbol definitions
    ///
    /// Examples:
    ///   meta-ast inspect ./my-project
    ///   meta-ast inspect ./my-project/main.py -f yaml -o symbols.yaml
    ///   meta-ast inspect ./my-project --language python
    Inspect(InspectArgs),

    /// Build a cross-file dependency graph and analyze Strongly Connected Components (SCCs)
    ///
    /// Examples:
    ///   meta-ast graph ./my-project
    ///   meta-ast graph ./my-project --html -o project_graph.html
    ///   meta-ast graph ./my-project -f yaml -o graph.yaml
    Graph(GraphArgs),

    /// Scan cross-language call sites and generate MetaCall deployment manifests
    ///
    /// Examples:
    ///   meta-ast deploy ./my-project --out ./deploy-dir
    ///   meta-ast deploy ./my-project --check
    #[cfg(feature = "metacall-deploy")]
    Deploy(DeployArgs),
}

fn parse_format(s: &str) -> Result<crate::output::OutputFormat, String> {
    match s.to_lowercase().as_str() {
        "json" => Ok(crate::output::OutputFormat::Json),
        "yaml" | "yml" => Ok(crate::output::OutputFormat::Yaml),
        _ => Err(format!("invalid format '{s}': expected 'json' or 'yaml'")),
    }
}

fn parse_language(s: &str) -> Result<crate::language::LangId, String> {
    let normalized = s.to_lowercase();
    crate::language::LangId::from_str(&normalized).map_err(|_| {
        let all = crate::language::LangId::all();
        let names: Vec<_> = all.iter().map(|l| l.as_ref()).collect();
        format!(
            "invalid language '{s}': expected one of {}",
            names.join(", ")
        )
    })
}

#[derive(Parser)]
pub struct InspectArgs {
    /// Root directory or source file to inspect
    pub path: std::path::PathBuf,

    /// Output file path (prints to stdout if omitted)
    #[arg(short, long)]
    pub output: Option<std::path::PathBuf>,

    /// Only analyze files detected as this language
    #[arg(short, long, value_parser = parse_language)]
    pub language: Option<crate::language::LangId>,

    /// Output format for the extracted symbols
    #[arg(short = 'f', long, default_value = "json", value_parser = parse_format)]
    pub format: crate::output::OutputFormat,

    /// Diagnostic severity that makes the run exit with status 1
    #[arg(long, value_enum, default_value_t = crate::interface::report::FailOn::Error)]
    pub fail_on: crate::interface::report::FailOn,
}

#[derive(Parser)]
pub struct GraphArgs {
    /// Root directory to analyze
    pub path: std::path::PathBuf,

    /// Output file path (defaults to stdout, or `<path>.html` with --html)
    #[arg(short, long)]
    pub output: Option<std::path::PathBuf>,

    /// Only analyze files detected as this language
    #[arg(short, long, value_parser = parse_language)]
    pub language: Option<crate::language::LangId>,

    /// Output serialization format for the graph structure
    #[arg(short = 'f', long, default_value = "json", value_parser = parse_format)]
    pub format: crate::output::OutputFormat,

    /// Diagnostic severity that makes the run exit with status 1
    #[arg(long, value_enum, default_value_t = crate::interface::report::FailOn::Error)]
    pub fail_on: crate::interface::report::FailOn,

    /// Generate an interactive HTML dashboard with graph visualization
    #[arg(long)]
    pub html: bool,

    /// Open the written dashboard in the default browser (needs --html)
    #[arg(long, requires = "html")]
    pub open: bool,

    /// Also emit a portable datagraph export (requires --features dataflow)
    #[cfg(feature = "dataflow")]
    #[arg(long)]
    pub datagraph: bool,

    /// Output file for the datagraph export (defaults to the graph output name plus `.datagraph.json`)
    #[cfg(feature = "dataflow")]
    #[arg(long)]
    pub datagraph_output: Option<std::path::PathBuf>,

    /// Enter watch mode: monitor the project and re-analyze on file changes
    #[cfg(feature = "watch")]
    #[arg(long)]
    pub watch: bool,

    /// Debounce duration in milliseconds for watch mode (default: 200)
    #[cfg(feature = "watch")]
    #[arg(long, default_value = "200")]
    pub watch_debounce: u64,
}

#[cfg(feature = "metacall-deploy")]
#[derive(Parser)]
pub struct DeployArgs {
    /// Root directory of the project to analyze
    pub path: std::path::PathBuf,

    /// Output format for generated manifests
    #[arg(short = 'f', long, default_value = "json", value_parser = parse_format)]
    pub format: crate::output::OutputFormat,

    /// Check mode: diff generated manifests against existing metacall.json
    #[arg(long)]
    pub check: bool,

    /// Output directory for generated manifests and mesh annotation
    #[arg(short, long, default_value = ".")]
    pub out: std::path::PathBuf,

    /// Maximum number of files in a single pod before rebalancing is triggered
    #[arg(long, default_value_t = crate::deploy::cut::DEFAULT_MAX_POD_SIZE)]
    pub max_pod_size: usize,

    /// Diagnostic severity that makes the run exit with status 1
    #[arg(long, value_enum, default_value_t = crate::interface::report::FailOn::Error)]
    pub fail_on: crate::interface::report::FailOn,
}

/// The CLI owns the mapping from parsed arguments to the emitter configuration.
impl From<&InspectArgs> for crate::output::emitter::EmitConfig {
    fn from(args: &InspectArgs) -> Self {
        Self {
            output: args.output.clone(),
            format: args.format,
            html: false,
            open_browser: false,
        }
    }
}

impl From<&GraphArgs> for crate::output::emitter::EmitConfig {
    fn from(args: &GraphArgs) -> Self {
        Self {
            output: args.output.clone(),
            format: args.format,
            html: args.html,
            open_browser: true,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn parse_language_valid_lowercase() {
        assert_eq!(
            parse_language("python"),
            Ok(crate::language::LangId::Python)
        );
        assert_eq!(
            parse_language("typescript"),
            Ok(crate::language::LangId::TypeScript)
        );
    }

    #[test]
    fn parse_language_case_insensitive() {
        assert_eq!(
            parse_language("Python"),
            Ok(crate::language::LangId::Python)
        );
        assert_eq!(
            parse_language("TYPESCRIPT"),
            Ok(crate::language::LangId::TypeScript)
        );
    }

    #[test]
    fn parse_language_invalid_returns_all_names() {
        let err = parse_language("pytho").unwrap_err();
        for id in crate::language::LangId::all() {
            let name: &str = id.as_ref();
            assert!(
                err.contains(name),
                "error {err:?} should list the valid name {name:?}"
            );
        }
    }

    #[test]
    fn parse_language_empty_returns_err() {
        assert!(parse_language("").is_err());
    }

    #[test]
    fn opening_the_dashboard_is_an_opt_in() {
        let parsed = Cli::try_parse_from(["meta-ast", "graph", "demo", "--html", "--open"]);
        assert!(
            parsed.is_ok(),
            "graph --html --open parses: {:?}",
            parsed.as_ref().err()
        );
        assert!(
            matches!(parsed, Ok(Cli::Graph(ref args)) if args.open),
            "the flag reaches the parsed arguments"
        );
        assert!(
            Cli::try_parse_from(["meta-ast", "graph", "demo", "--open"]).is_err(),
            "--open without --html is a usage error"
        );
    }
}